Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Microsoft Paint - Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.